Fig. 2
Logarithm of the cost function f as a function of the chromatic parameters 
and denv. The green circle represents the pair of chromatic parameters where the cost-function value is the smallest. The cyan horizontal line is the stellar-to-total flux ratio from the best-fit geometrical model (
= 0.28). The cyan circle is the pair of chromatic parameters giving the most likely image reconstruction using
from the geometrical model fitting.
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